Those two additional chances at rebirth were his greatest trump card against evenly matched opponents.
They were extremely useful even against enemies who were slightly stronger than him.
Being able to undergo rebirth, he had the confidence to put his life on the line.
Even if he traded blow for blow with his enemy, sustaining injuries in the process as they dragged each other down into death, he would still be fine with that.
One who puts his life on the line cannot be defeated by ten thousand enemies-this phrase might be rather exaggerated.
Still, as two enemies fought and one did not fear death in the least, the other side would inevitably gradually be left hard pressed to parry their blows.
This was because they could not afford to lose.